doc(book/ffi): remove duplicate link reference `[libc]'
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@ -517,8 +517,6 @@ The [`libc` crate on crates.io][libc] includes type aliases and function
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definitions for the C standard library in the `libc` module, and Rust links
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against `libc` and `libm` by default.
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[libc]: https://crates.io/crates/libc
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# The "nullable pointer optimization"
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Certain types are defined to not be `null`. This includes references (`&T`,
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